脑电信号本身很微弱、并伴有很强的背景噪声，但其中蕴藏着多种生理现象，有着非常重要的临床价值。
EEG signals are very weak, generally accompanied by strong background noises, but they reflect various physiological phenomena and make great sense in the clinical condition.
在我们研制的视觉电生理地形图系统中，成功地用它从背景噪声中提取出VEP信号，完成信号的预处理。
The authors extracted VEP signals from the background noises by wavelet transform successfully and completed the preprocessing of the signals.
音乐可以调节人体的生理状态，而噪声则对人体十分有害；
Music can adjusting the human's physiological state, whereas the noise is bad;
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